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Implementing SSH Strategies for Optimizing the Secure Shell phần 6

Chuyển đổi chính khách hàng OpenSSH của bạn sang định dạng tương thích truyền thông SSH SSH. Để chuyển đổi các phím, bạn phải thiết lập một mật khẩu trống cho các khóa riêng (ssh-keygen-p-f Shreya). Sau khi cuộc nói chuyện quan trọng là hoàn tất, hãy đảm bảo bạn quay trở lạ | SSH Management 177 Figure 5.11 The new set of user restrictions. SSH Network Access Controls Installing an SSH management server adds tremendous flexibility and security to any network environment. The use of SOCKS and Chroot helps further streamline and secure management access to sensitive servers and devices. Another method to help secure the SSH management server is the use of TCP wrappers on Unix SSH servers and connection filters on Windows SSH servers. SSH TCP wrappers TCP Wrappers is a Unix utility that permits or denies network access to a particular port to a specified set of IP addresses. TCP wrappers functions by replacing the network service with the TCP wrapper service before the communication can be completed. The IP addresses for TCP wrappers are located in the hosts.allow and hosts.deny. For example before any IP address can connect to a particular service port on a system using TCP wrappers the TCP wrappers utility first checks to see if the requesting IP address is approved to access the service port. If TCP wrappers deems that the IP address is allowed by checking the hosts.allow and hosts.deny files the requesting IP address is allowed to continue to access the service and port. Note that even though the IP address is allowed to access the service port the IP address will still need to carry out any authentication requirements for the service. Figure 5.12 shows the TCP-wrappers process. 178 Chapter 5 Without TCP Wrappers SSH Client SSH Service With TCP Wrappers SSH Session SSH Client M l TCP Wrapper SSH Service Figure 5.12 TCP wrappers with SSH. SSH Session A good way to think of TCP wrappers is simply as a set of access-control lists applied to specific TCP ports on a Unix operating system. For example once an SSH management server is set up to administer sensitive servers and or devices there may be a need to secure the access to the SSH server to only the firewall admin group s subnet or the backup operator s subnet or any machine located in